155 citations · 757 across the 21 of their papers we have counts for
22 papers
Cosmological Correlator Discontinuities from Scattering Amplitudes
Chandramouli Chowdhury, Sadra Jazayeri, Arthur Lipstein +3
Recent theoretical work has revealed that basic observables of quantum field theory in de Sitter space, known as in-in or cosmological correlators, exhibit surprisingly simple math…
Every Wrinkle Carries A Memory: An Integro-differential Bootstrap for Features in Cosmological Correlators
Sadra Jazayeri, Xi Tong, Yuhang Zhu
Motivated by cosmological observations, we push the cosmological bootstrap program beyond the de Sitter invariance lamppost by considering correlators that explicitly break scale i…
Bispectrum Islands
Claudia de Rham, Sadra Jazayeri, Andrew J. Tolley
Inspired by the amplitude bootstrap program, the spirit of this work is to constrain the space of consistent inflationary correlation functions - specifically, the bispectrum of cu…
The Massive Flat Space Limit of Cosmological Correlators
Sebastian Cespedes, Sadra Jazayeri
Identifying useful flat-space limits for cosmological correlators, where they can be expressed in terms of observables in Minkowski space is nontrivial due to their scale-invariant…
Parity Violation from Emergent Non-Locality During Inflation
Sadra Jazayeri, Sébastien Renaux-Petel, Xi Tong +2
Parity violation in the early universe holds great promise for uncovering new physics. In particular, the primordial scalar four-point correlation function is allowed to develop a…
Shapes of the Cosmological Low-Speed Collider
Sadra Jazayeri, Sébastien Renaux-Petel, Denis Werth
Massive particles produced during inflation leave specific signatures in soft limits of correlation functions of primordial fluctuations. When the Goldstone boson of broken time tr…
Parity violation in the scalar trispectrum: no-go theorems and yes-go examples
Giovanni Cabass, Sadra Jazayeri, Enrico Pajer +1
We derive a set of no-go theorems and yes-go examples for the parity-odd primordial trispectrum of curvature perturbations. We work at tree-level in the decoupling limit of the Eff…
Cosmological Bootstrap in Slow Motion
Sadra Jazayeri, Sébastien Renaux-Petel
Speed matters. How the masses and spins of new particles active during inflation can be read off from the statistical properties of primordial density fluctuations is well understo…
Cutting Cosmological Correlators
Harry Goodhew, Sadra Jazayeri, Mang Hei Gordon Lee +1
The initial conditions of our universe appear to us in the form of a classical probability distribution that we probe with cosmological observations. In the current leading paradig…
From Locality and Unitarity to Cosmological Correlators
Sadra Jazayeri, Enrico Pajer, David Stefanyszyn
In the standard approach to deriving inflationary predictions, we evolve a vacuum state in time according to the rules of a given model. Since the only observables are the future v…
The Cosmological Optical Theorem
Harry Goodhew, Sadra Jazayeri, Enrico Pajer
The unitarity of time evolution, or colloquially the conservation of probability, sits at the heart of our descriptions of fundamental interactions via quantum field theory. The im…
The Cosmological Phonon: Symmetries and Amplitudes on Sub-Horizon Scales
Tanguy Grall, Sadra Jazayeri, David Stefanyszyn
In contrast to massless spinning particles, scalars are not heavily constrained by unitarity and locality. Off-shell, no gauge symmetries are required to write down manifestly loca…
Spatial Curvature at the Sound Horizon
Guus Avis, Sadra Jazayeri, Enrico Pajer +1
The effect of spatial curvature on primordial perturbations is controlled by , where is today's fractional density of spatial curvature and $ c_{s}…
Symmetric Scalars
Tanguy Grall, Sadra Jazayeri, Enrico Pajer
We provide a complete classification of Poincaré-invariant scalar field theories with an enlarged set of classical symmetries to leading order in derivatives, namely for the so-cal…
Cherenkov in the Sky: Measuring the Sound Speed of Primordial Scalar Fluctuations
Ali Akbar Abolhasani, Sadra Jazayeri
We consider production of additional relativistic particles coupled to the inflaton. We show that the imprints of these particles on the spectrum of primordial perturbations can be…
Solid Soft Theorems
Enrico Pajer, Sadra Jazayeri, Drian van der Woude
We derive cosmological soft theorems for solids coupled to gravity. To this end, we first derive all cosmological adiabatic modes for solids, which display the interesting novelty…
Systematics of Adiabatic Modes: Flat Universes
Enrico Pajer, Sadra Jazayeri
Adiabatic modes are cosmological perturbations that are locally indistinguishable from a (large) change of coordinates. At the classical level, they provide model independent solut…
Bubble nucleation and inflationary perturbations
Hassan Firouzjahi, Sadra Jazayeri, Asieh Karami +1
In this work we study the imprints of bubble nucleation on primordial inflationary perturbations. We assume that the bubble is formed via the tunneling of a spectator field from th…
Primordial anisotropies from cosmic strings during inflation
Sadra Jazayeri, Alireza Vafaei Sadr, Hassan Firouzjahi
In this work we study the imprints of a primordial cosmic string on inflationary power spectrum. Cosmic string induces two distinct contributions on curvature perturbations power s…
Ghost inflation and de Sitter entropy
Sadra Jazayeri, Shinji Mukohyama, Rio Saitou +1
In the setup of ghost condensation model the generalized second law of black hole thermodynamics can be respected under a radiatively stable assumption that couplings between the f…
Effective Field Theory of non-Attractor Inflation
Mohammad Akhshik, Hassan Firouzjahi, Sadra Jazayeri
We present the model-independent studies of non attractor inflation in the context of effective field theory (EFT) of inflation. Within the EFT approach two independent branches of…
Inflationary power asymmetry from primordial domain walls
Sadra Jazayeri, Yashar Akrami, Hassan Firouzjahi +2
We study the asymmetric primordial fluctuations in a model of inflation in which translational invariance is broken by a domain wall. We calculate the corrections to the power spec…